Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
December
Weather in December
Temperature
December brings a slight decrease in the average high-temperature, shifting from a fresh 10.4°C (50.7°F) in November to a frosty 7.1°C (44.8°F). Guyancourt reports an average low-temperature of 2.7°C (36.9°F) during the subtly cooler December nights.Humidity
The months with the highest humidity are January and December, with an average relative humidity of 86%.Rainfall
In Guyancourt, in December, it is raining for 14.1 days, with typically 31mm (1.22") of accumulated precipitation. In Guyancourt, during the entire year, the rain falls for 156.2 days and collects up to 318mm (12.52") of precipitation.Snowfall
January through March, November and December are months with snowfall in Guyancourt, France. The months with the most snowfall are January, March and December, with an average 18mm (0.71") of accumulated snow.Daylight
The month with the shortest days in Guyancourt is December, with an average of 8h and 18min of daylight.On the first day of December, sunrise is at 08:23 and sunset at 16:57. On the last day of the month, sunrise is at 08:44 and sunset at 17:05 CET.
Sunshine
In Guyancourt, the average sunshine in December is 4.2h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Guyancourt. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: In December, an average UV index of 2 transforms into the following instructions:
Though extended exposure to the sun typically does not concern most people, it is crucial to always shield children, infants, and those with sensitive skin. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Guyancourt in December?
What is the most humid month in Guyancourt?
What is the average humidity in December in Guyancourt?
How many days does it rain in December in Guyancourt?
When does it snow the most in Guyancourt?
How much does it snow in Guyancourt in December?
What is the month with the shortest days in Guyancourt?
What is the average length of the day in December in Guyancourt?
When is the sunrise / sunset in December in Guyancourt?
How many hours of sunshine does Guyancourt have in December?
What is the month with the lowest UV index in Guyancourt?
How high is the UV index in December in Guyancourt?
Average temperature in December
Guyancourt, France
- Average high temperature in December: 7.1°C
The warmest month (with the highest average high temperature) is August (24.3°C).
The month with the lowest average high temperature is January (5.8°C).
- Average low temperature in December: 2.7°C
The months with the highest average low temperature are July and August (14.4°C).
The coldest months (with the lowest average low temperature) are January and February (1.6°C).
Average pressure in December
Guyancourt, France
- Average pressure in December: 1018.3mbar
The month with the highest atmospheric pressure is December (1018.3mbar).
The month with the lowest atmospheric pressure is November (1013.4mbar).
Average wind speed in December
Guyancourt, France
- Average wind speed in December: 15.6km/h
The windiest month (with the highest average wind speed) is February (16km/h).
The calmest month (with the lowest average wind speed) is August (10.3km/h).
Average humidity in December
Guyancourt, France
- Average humidity in December: 86%
The months with the highest relative humidity are January and December (86%).
The month with the lowest relative humidity is August (69%).
Average rainfall in December
Guyancourt, France
- Average rainfall in December: 31mm
The wettest month (with the highest rainfall) is June (40mm).
The driest month (with the least rainfall) is September (15mm).
Average rainfall days in December
Guyancourt, France
- Average rainfall days in December: 14.1 days
The month with the highest number of rainy days is June (15.9 days).
The month with the least rainy days is September (9.6 days).
Average snowfall in December
Guyancourt, France
- Average snowfall in December: 18mm
The months with the highest snowfall are January, March and December (18mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in December
Guyancourt, France
- Average snowfall days in December: 2.4 days
The month with the highest number of snowfall days is February (3.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Guyancourt, France
- Average daylight in December: 8h and 2min
The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 18min).
- Average sunshine in December: 4h and 1min
The months with the most sunshine are July and August (Average sunshine: 9h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in December
Guyancourt, France
- Average sunshine days in December: 12.7 days
The month with the most sunshine days is September (17.1 days).
The month with the least sunshine days is June (10.9 days).
Average UV index in December
Guyancourt, France
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Guyancourt, France
- Average cloud cover in December: 58
The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is September (Cloud cover 38).
Average visibility in December
Guyancourt, France
- Average visibility in December: 9km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
